> So there is no need to scan the databases then.

"No need" is a bit too strong. It's true that, generally, there is no need to 
run an on-demand scanner regularly - but many people like to do that; perhaps 
in order to get a confirmed feeling that their machine is clean (even if that 
feeling is, in some cases, ill-founded).

In general, we do on-demand scanning after booting from a known-clean 
environment (e.g., a bootable CD-ROM), in order to ensure that a system is 
really clean. Anything less (i.e., running the scanner with the virus 
potentially active) is unreliable. It's not easy to translate this concept to 
the PalmOS environment - perhaps, if the scanner was in ROM and scanning after 
a hard reset...

Also, the algorithms for on-demand scanning are sometimes used during what 
should be considered on-access scanning. For instance, one of the possible 
virus entry points is the insertion of a memory card. When this event occurs 
(i.e., on-access), the scanner should start scanning the card - but it would do 
it just the same way as an on-demand scanner when the latter is told to scan 
the card on demand.

> What if I just bought your antivirus and want to make sure that
> there is no virus on my palm?

Mine will be free, so you won't have to buy it. :-) But, jokes aside, the 
proper way to do it is like this: after a hard reset, you should install the 
virus protection first and only then you should start installing everything 
else. This will ensure that the protection is started in a virus-free 
environment and it should prevent any known viruses from entering after that 
point. (Modulo the cases when a virus could have burned itself in the Flash ROM 
- on those devices on which this is possible.)

Regards,
Vesselin
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